(a)(1) Except as provided in paragraphs (b) and (c) of this section, when the marriage of a retiree who retired on or after May 7, 1985, terminates after retirement, he or she may elect in writing a fully reduced annuity or a partially reduced annuity to provide a former spouse annuity. Such an election must be filed with OPM within 2 years after the retiree's marriage to the former spouse terminates.

(2) Except as provided in paragraphs (b) and (c) of this section, a retiree who retired before May 7, 1985, and whose marriage was terminated on or after May 7, 1985, may elect in writing a fully reduced annuity or a partially reduced annuity to provide a former spouse annuity if the retiree while married to the former spouse had elected, prior to May 7, 1985, a reduced annuity to provide a current spouse annuity for that spouse. Such an election must be filed with OPM within 2 years after the retiree's marriage to the former spouse terminates.

(3) Except as provided in paragraphs (b) and (c) of this section, a retiree who retired on or after May 7, 1985, and before February 27, 1986, and whose marriage terminated before May 7, 1985, may elect in writing a fully reduced annuity or a partially reduced annuity to provide a former spouse annuity. Such an election must be made no later than February 27, 1988.

(b)(1) Qualifying court orders prevent payment of former spouse annuities to the extent necessary to comply with the court order and § 831.641.

(2) A retiree who elects a fully or partially reduced annuity to provide a former spouse annuity may not elect to provide a former spouse annuity in an amount that either—

(i) Is smaller than the amount required by a qualifying court order; or

(ii) Would cause the sum of all current and former spouse annuities based on a retiree's elections under §§ 831.611, 831.612, 831.631 and this section to exceed 55 percent of the rate of the retiree's self-only annuity if the retiree's retirement was based on a separation from a position under CSRS on or after October 11, 1962, or 50 percent of the rate of the retiree's self-only annuity if the retiree's retirement was based on a separation from a position under CSRS before October 11, 1962.

(3) An election under this section is void—

(i) In the case of a married retiree, if the current spouse does not consent to the election on a form as described in § 831.614(c) and spousal consent is not waived by OPM in accordance with § 831.618; or

(ii) To the extent that it provides a former spouse annuity for the spouse who was married to the retiree at the time of retirement in an amount that is inconsistent with any joint designation or waiver made at the time of retirement under § 831.611 (a)(1) or (a)(2); or

(iii) In the case of an election under paragraph (a)(2) of this section, to the extent that it provides a former spouse annuity that exceeds the proportion of the retiree's annuity to which the former spouse would have been entitled as a current spouse annuity as of May 7, 1985.

(c) An election under this section is not permitted unless the retiree agrees to deposit the amount equal to the difference between the amount of annuity actually paid to the retiree and the amount of annuity that would have been paid if the reduction elected under paragraph (a) of this section had been in effect continuously since the time of retirement, plus 6 percent annual interest, computed under § 831.105, from the date when each difference occurred.

(d) Any reduction in an annuity to provide a former spouse annuity will terminate on the first day of the month after the former spouse remarries before age 55 or dies, or the former spouse's eligibility for a former spouse annuity terminates under the terms of a qualifying court order, unless—

(1) The retiree elects, within 2 years after the event causing the former spouse to lose eligibility, to continue the reduction to provide or increase a former spouse annuity for another former spouse, or to provide or increase a current spouse annuity; or

(2) A qualifying court order requires the retiree to provide another former spouse annuity.

(e)(1) The amount of the reduction to provide one or more former spouse annuities or a combination of a current spouse annuity and one or more former spouse annuities under this section equals 2 1/2 percent of the first $3600 of the total designated survivor base plus 10 percent of the portion of the total designated survivor base which exceeds $3600, if—

(i) The employee's or Member's separation on which the retirement is based was on or after October 11, 1962; or

(ii) The reduction is to provide a former spouse annuity (under § 831.632) for a former spouse whom the employee or Member married after retirement.

(2) The amount of the reduction to provide one or more former spouse annuities or a combination of a current spouse annuity and one or more former spouse annuities under this section for employees or Members whose retirement is based on separations before October 11, 1962, equals 2 1/2 percent of the first $2400 of the total designated survivor base plus 10 percent of the portion of the total designated survivor base which exceeds $2400.